i use the ones from Polish Bliss,

http://www.polishedbliss.co.uk/acata...wel-cat24.html

http://www.polishedbliss.co.uk/acata...MasterPWST0000

Both Poor Boys and work well, Once used stick them in the washing maching, little detergenat (minimal) and wash then was again on a rinse and spin cycle. Always seem to be spot on.